Fits knee 16 to 20 inches. Elasto-Preene: Heat retention. Moisture release. Comfortable and breathable. Heat Retention: Improves circulation and helps promote healing (BD Cares: This is not a substitute for medical advice. Always consult a medical professional for advice about treatment of injuries or irritation.). Advanced. Breathable elastic/neoprene blend. Elastic woven fabric. Elasto-Preene Supports are an innovative surgical elastic/neoprene blend, which provide the desired level of comfort, support and stability coupled with the benefits of heat retention. 1. Soft breathable neoprene blended panel stitched around the knee joint provides a soothing warm feeling to painful areas. 2. Compression helps to reduce swelling to injured areas. 3. Finished edges that are reinforced provide comfort and prevent against rolling and slipping. 4. Breathable elastic material to release moisture. Protection Levels: Advanced - Designed to provide moderate support during activities and should be worn as needed. ACE Brand Knee Supports are designed to provide you with the optimal support you need while assuring proper fit and comfort.